Backup exec 2010, (with advanced file open option off), when the exchange 2003 server gets backed up there's an IMG subfolder containing exchange, with the b2d files for the rest of the backup.

After the main backup is a job that copies the b2d files and currently the img folder to an external drive.

Questions: do I really need to copy the IMG folder as well as the b2d files to the external drive? is the IMG not contained in the b2d files?